In a supply chain attack that may be unprecedented in the number of downloads, servers hosting CCleaner, a popular tool for cleaning up the PC, has been delivering a version of the said software with malware.

What happened?

Threat actors have managed to change the files that were being delivered by Avast servers hosting CCleaner updates. In case you are wondering why they were on those servers, Avast acquired Piriform, the original publishers of CCleaner, a few months ago.

The incident was discovered and reported by Talos. Piriform is aware of the situation and is acting to prevent further damage. They are also investigating how the files coming from their servers were modified before being released to the public.

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